Why would you have to wait to transfer to a new doctor? That seems absurd to me. You want a new doctor - you call the new doctor and make an appointment. It shouldn't be that hard. And if it is an insurance issue, then make a point to take care of it. Work on it a little every day until you are taken care of.
Get a note from your doctor (your new one, your old one. Doesn't matter) that says you cannot lift anything over 40 lbs. due to pregnancy. Employers don't always like this, but they have to do it.
As far as the yeast infection goes, if you know it is a yeast infection do not wait around for your doctor to check it out. Go get some medication from the drugstore! Yeast infections can be brutal - you shouldn't suffer needlessly when there are tons of medications for it readily available to you.